﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Security.Cryptography;

namespace Janus.Cores.Security
{
  public  class RijndaelSecurity
    {
      private static SymmetricAlgorithm mobjCryptoService;
      private static string Key;
        /**//// <summary>
        /// 对称加密类的构造函数
        /// </summary>
        static RijndaelSecurity()
        {
            mobjCryptoService = new RijndaelManaged();
            Key = "luochengbang@163.com";
        }
        /**//// <summary>
        /// 获得密钥
        /// </summary>
        /// <returns>密钥</returns>
        private static byte[] GetLegalKey()
        {
            string sTemp = Key;
            mobjCryptoService.GenerateKey();
            byte[] bytTemp = mobjCryptoService.Key;
            int KeyLength = bytTemp.Length;
            if (sTemp.Length > KeyLength)
                sTemp = sTemp.Substring(0, KeyLength);
            else if (sTemp.Length < KeyLength)
                sTemp = sTemp.PadRight(KeyLength, ' ');
            return ASCIIEncoding.ASCII.GetBytes(sTemp);
        }
        /**//// <summary>
        /// 获得初始向量IV
        /// </summary>
        /// <returns>初试向量IV</returns>
        private static byte[] GetLegalIV()
        {
            string sTemp = "luochengbang@163.com";
            mobjCryptoService.GenerateIV();
            byte[] bytTemp = mobjCryptoService.IV;
            int IVLength = bytTemp.Length;
            if (sTemp.Length > IVLength)
                sTemp = sTemp.Substring(0, IVLength);
            else if (sTemp.Length < IVLength)
                sTemp = sTemp.PadRight(IVLength, ' ');
            return ASCIIEncoding.ASCII.GetBytes(sTemp);
        }
        /**//// <summary>
        /// 加密方法
        /// </summary>
        /// <param name="Source">待加密的串</param>
        /// <returns>经过加密的串</returns>
        public static string Encrypto(string Source)
        {
            byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
            MemoryStream ms = new MemoryStream();
            mobjCryptoService.Key = GetLegalKey();
            mobjCryptoService.IV = GetLegalIV();
            ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
            cs.Write(bytIn, 0, bytIn.Length);
            cs.FlushFinalBlock();
            ms.Close();
            byte[] bytOut = ms.ToArray();
            return Convert.ToBase64String(bytOut);
        }
        /**//// <summary>
        /// 解密方法
        /// </summary>
        /// <param name="Source">待解密的串</param>
        /// <returns>经过解密的串</returns>
        public static string Decrypto(string Source)
        {
            byte[] bytIn = Convert.FromBase64String(Source);
            MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
            mobjCryptoService.Key = GetLegalKey();
            mobjCryptoService.IV = GetLegalIV();
            ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cs);
            return sr.ReadToEnd();
        }

        //默认密钥向量
        private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        /**/
        /**/
        /**/
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
        public static string EncryptDES(string encryptString)
        {
            //try
            //{
            //    byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
            //    byte[] rgbIV = Keys;
            //    byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
            //    DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
            //    MemoryStream mStream = new MemoryStream();
            //    CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
            //    cStream.Write(inputByteArray, 0, inputByteArray.Length);
            //    cStream.FlushFinalBlock();
            //    return Convert.ToBase64String(mStream.ToArray());
            //}
            //catch
            //{
            //    return encryptString;
            //}
            if (string.IsNullOrEmpty(encryptString)) return string.Empty;
            return Convert.ToBase64String(Encoding.UTF8.GetBytes(encryptString));
        }

        /**/
        /**/
        /**/
        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
        public static string DecryptDES(string decryptString)
        {
            //try
            //{
            //    byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
            //    byte[] rgbIV = Keys;
            //    byte[] inputByteArray = Convert.FromBase64String(decryptString);
            //    DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
            //    MemoryStream mStream = new MemoryStream();
            //    CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
            //    cStream.Write(inputByteArray, 0, inputByteArray.Length);
            //    cStream.FlushFinalBlock();
            //    return Encoding.UTF8.GetString(mStream.ToArray());
            //}
            //catch
            //{
            //    return decryptString;
            //}
            if (string.IsNullOrEmpty(decryptString)) return string.Empty;

            return Encoding.UTF8.GetString(Convert.FromBase64String(decryptString));
        } 



    }
}
